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Investment in Unconsolidated Ventures (Narrative) (Details) (USD $) | 3 Months Ended | 0 Months Ended |  |  |
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Mar. 31, 2015 apartment_unit Room sqft acre real_estate_venture building | Jan. 30, 2015 | Feb. 27, 2015 | Dec. 31, 2014 | Mar. 31, 2014 real_estate_venture | Dec. 19, 2007 sqft
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | 17 bdn_NumberOfUnconsolidatedInvestmentsInRealEstateVentures |  |  |  | 17 bdn_NumberOfUnconsolidatedInvestmentsInRealEstateVentures |
Equity Method Investments including net liabilities | $ 232,300,000 bdn_EquityMethodInvestmentsincludingnetliabilities |  |  |  |  |
Company's share of equity (Company's basis) | 233,478,000 us-gaap_EquityMethodInvestments |  |  | 225,004,000 us-gaap_EquityMethodInvestments |  |
Number of negative investment real estate ventures | 1 bdn_NumberofRealEstateVentureswithNegativeInvestmentBalances |  |  |  |  |
Number of real estate ventures that owns buildings | 11 bdn_NumberOfRealEstateVenturesThatOwnsBuildings |  |  |  |  |
Number of office buildings in Real Estate Ventures | 65 bdn_NumberOfOfficeBuildingsInRealEstateVentures |  |  |  |  |
Aggregate Approximate Area Of Office Buildings | 6,700,000 bdn_AggregateApproximateAreaOfOfficeBuildings |  |  |  |  |
Number of real estate ventures that owns undeveloped land | 1 bdn_NumberOfRealEstateVenturesThatOwnsUndevelopedLand |  |  |  |  |
Area Owned By Real Estate Venture Of Undeveloped Parcels Of Land | 3 bdn_AreaOwnedByRealEstateVentureOfUndevelopedParcelsOfLand |  |  |  |  |
Number of real estate ventures that owns land under development | 3 bdn_NumberOfRealEstateVenturesThatOwnsLandUnderDevelopment |  |  |  |  |
Area Owned By Real Estate Venture in Parcels Of Land Under Development | 22.6 bdn_AreaOwnedByRealEstateVentureInParcelsOfLandUnderDevelopment |  |  |  |  |
Number of Real Estate Investments in residential towers | 1 bdn_NumberofRealEstateInvestmentsinresidentialtowers |  |  |  |  |
Number of apartment units in a Real Estate Venture | 345 bdn_NumberofapartmentunitsinaRealEstateVenture |  |  |  |  |
Number of real estate ventures developed hotel property | 1 bdn_NumberOfRealEstateVenturesDevelopedHotelProperty |  |  |  |  |
Number Of Rooms Contain In One Real Estate Venture Developed As Hotel Property | 137 bdn_NumberOfRoomsContainInOneRealEstateVentureDevelopedAsHotelProperty |  |  |  |  |
Minimum Percentage Of Unconsolidated Equity Method Investment Ownership | 20.00%bdn_MinimumPercentageOfUnconsolidatedEquityMethodInvestmentOwnership |  |  |  |  |
Maximum Percentage Of Unconsolidated Equity Method Investment Ownership | 65.00%bdn_MaximumPercentageOfUnconsolidatedEquityMethodInvestmentOwnership |  |  |  |  |
River Place [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Proceeds from Collection of Notes Receivable |  | 88,000,000 us-gaap_ProceedsFromCollectionOfNotesReceivable / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_RiverPlaceMember |  |  |  |
Coppell Associates [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Company's share of equity (Company's basis) | (1,200,000)us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_CoppellAssociatesMember |  |  | (1,200,000)us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_CoppellAssociatesMember |  |
GI Interchange Office LLC (DRA — N. PA) [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of Real Estate Properties |  |  |  |  |  | 29 us-gaap_NumberOfRealEstateProperties / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_GiInterchangeOfficeLlcDraNPaMember
Net Rentable Area |  |  |  |  |  | 1,611,961 us-gaap_NetRentableArea / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_GiInterchangeOfficeLlcDraNPaMember
Forbearance Agreement, Lender Extension Term |  |  | 60 days |  |  |
Non-Recourse Debt |  |  | 174,200,000 us-gaap_NonRecourseDebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_GiInterchangeOfficeLlcDraNPaMember |  |  |
TB-BDN Plymouth Apartments [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Guarantor Obligations, Current Carrying Value | 3,200,000 us-gaap_GuarantyLiabilities / dei_LegalEntityAxis = bdn_TbBdnPlymouthApartmentsMember |  |  |  |  |
Unconsolidated Real Estate Ventures [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net rentable square feet | 6,700,000 us-gaap_AreaOfRealEstateProperty / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember |  |  |  | 5,700,000 us-gaap_AreaOfRealEstateProperty / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember |
The Grove at Cira Centre South [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Guarantor Obligations, Current Carrying Value | 24,700,000 us-gaap_GuarantyLiabilities / dei_LegalEntityAxis = bdn_GroveAtCiraCentreSouthMember |  |  |  |  |
PJP VII [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Guarantor Obligations, Current Carrying Value | $ 500,000 us-gaap_GuarantyLiabilities / dei_LegalEntityAxis = bdn_PjpViiMember |  |  |  |  |
DRA Advisors LLC [Member] | GI Interchange Office LLC (DRA — N. PA) [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 80.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / bdn_JointVentureMembersAxis = bdn_DRAAdvisorsLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_GiInterchangeOfficeLlcDraNPaMember
Brandywine Realty Trust [Member] | GI Interchange Office LLC (DRA — N. PA) [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / bdn_JointVentureMembersAxis = bdn_BrandywineRealtyTrustMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_GiInterchangeOfficeLlcDraNPaMember

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